ON DISEASES OF THE EYES. 5O9 



The pupil neither dilates nor contracls, which 

 is pretty much the fame as to fay, the eye, or 

 rather its vifion, is extinft ; and that again is to 

 fay, no cure need be expefted. The defe61; 

 has always been fuppofed to originate in a 

 want of initability in the optic nerve. Ac- 

 cording to Darwin. Eleftricity. Blillers on 

 the head. Opium, and corrofive fublimate 

 mercury, four or fix weeks. Would not 

 fneezing powders be beneficial in the beginning 

 of the difeafe, or turninsr to grafs, that the con- 

 ilant depending fituation of the head in feed- 



|fc. ing, might invite an accefifion of blood and 



H nourifliment to the eyes? 



H External ACCIDENTS. Contufions on the 

 eyes are to be treated with coolers, repellents, 

 fomentations or poultices, and bleeding. Som.e- 



W times from a blow or (Iroke upon the eye, the 

 juices, naturally clear and pellucid, will ftag- 



^' nate and turn to a pearl colour, or quite white, 

 over the whole fur face, and the horfe will be 

 nearly or totally blind ; but fuch fymptoms 

 will in a few days fubmit to proper treatment". 

 Wounds of the eves may be mortal if they 

 penetrate the orbit to the bottom, v/here the 

 branches of the optic nerves pafs from the 

 cercbelluvi ; fiiould the retinahc preffed, which 

 is compofed.of the optic nerve, and many 

 fmall twigs of veins and arteries, blindnefs is 

 unavoidable, and perhaps convulfions may en- 



